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Part of NULL JSFX 2.6.1: 113 plugins, free and open source (MIT). Easiest with NULL JSFX Hub.
Listen
The same music with the Rumble Cut preset and without the plugin. Switch while it plays.
Controls
Cutoff20 to 20000 Hz — Cutoff (or centre) frequency of the filter.
Resonance0.1 to 10 — Q of the filter; higher values add a resonant peak at the cutoff (narrower band in Band Pass and Notch).
Gain−12 to +12 dB — Output level after the filter.
ModeLow Pass / High Pass / Band Pass / Notch — Filter response: Low Pass, High Pass, Band Pass (unity peak) or Notch.
Slope12 dB / 24 dB — Filter steepness: 12 dB/oct (one state-variable stage) or 24 dB/oct (a second Butterworth stage in the same mode).
Drive0 to 100% — Soft saturation of the input before the filter, for a warmer, growlier sound; 0% is off.
LFO Rate0.05 to 20 Hz — Speed of the cutoff LFO in Hz when LFO Sync is off.
LFO SyncOff / 1/1 / 1/2 / 1/4 / 1/8 / 1/16 / 1/4T / 1/8T / 1/4D / 1/8D — Locks the LFO to the host tempo as a note value (1/1 to 1/16, triplet or dotted); while the transport plays, the LFO follows the beat.
LFO Depth0 to 4 oct — How far the LFO sweeps the cutoff up and down, in octaves; 0 turns it off.
Envelope Depth−4 to +4 oct — How far the cutoff follows the input level, in octaves (positive opens it, negative closes it on loud parts) for auto-wah effects; 0 turns it off.
Env Attack1 to 200 ms — How fast the envelope follower reacts to rising input level.
Env Release10 to 2000 ms — How fast the envelope follower falls back when the input gets quieter.
Best uses
Taking the top end off harsh sources
Thinning out the low end with High Pass
Filter sweeps via automation
Telephone and radio tones with Band Pass
Cutting a single resonance with Notch
Properties
Input → 2-pole (12 dB/oct) state-variable filter (low-pass, high-pass, band-pass and notch from the same structure) → Gain → Output. Stable under fast automation; zero latency.
Formats
JSFXJSFX for REAPER, with REAPER's own sliders
GFXJSFX GFX for REAPER, with its own interface
VST3VST3 for any DAW
CLAPCLAP for any DAW
Factory presets
Rumble Cut · Vocal Clean Up · Warm Top Roll-Off · Next Room Muffle · Telephone Voice · Resonant Sweep Start · Resonance Notch · Wobble Filter · Envelope Wah · Acid 24 dB · Slow Sweep · Quarter Note Pulse HP
In the FX chains and Rack presets
Auto Filter · Cassette · Cosmic Space · Dirty Reverb · Dub Echo Bus · Fragment Gate · Frozen Hall · Glitch Band · Hat Shine · Kick Fertilizer · Lo-Fi · Lo-Fi Fader · Mix Bus Finisher · Motion Pad · Noise Layer · Octave Bloom · Old Radio · Parallel Drum Smash · Robot Radio Voice · Shift Mod · Small Speaker Check · Stepped Autopan · Stepped Filter · Stutter Build · VHS Tape